package com.example.xd.defaultcall.test;

import android.content.Context;
import android.graphics.RectF;
import android.os.Bundle;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.accessibility.AccessibilityEvent;
import android.view.accessibility.AccessibilityManager;
import android.view.accessibility.AccessibilityNodeInfo;
import android.widget.FrameLayout;

/**
 * @auther XuDan on 2020/6/29.
 */
public class DialpadKeyButton extends FrameLayout {

    /** Timeout before switching to long-click accessibility mode. */
    private static final int LONG_HOVER_TIMEOUT = ViewConfiguration.getLongPressTimeout() * 2;

    /** Accessibility manager instance used to check touch exploration state. */
    private AccessibilityManager accessibilityManager;

    /** Bounds used to filter HOVER_EXIT events. */
    private RectF hoverBounds = new RectF();

    /** Whether this view is currently in the long-hover state. */
    private boolean longHovered;

    /** Alternate content description for long-hover state. */
    private CharSequence longHoverContentDesc;

    /** Backup of standard content description. Used for accessibility. */
    private CharSequence backupContentDesc;

    /** Backup of clickable property. Used for accessibility. */
    private boolean wasClickable;

    /** Backup of long-clickable property. Used for accessibility. */
    private boolean wasLongClickable;

    /** Runnable used to trigger long-click mode for accessibility. */
    private Runnable longHoverRunnable;

    private OnPressedListener onPressedListener;

    public DialpadKeyButton(Context context, AttributeSet attrs) {
        super(context, attrs);
        initForAccessibility(context);
    }

    public DialpadKeyButton(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        initForAccessibility(context);
    }

    public void setOnPressedListener(OnPressedListener onPressedListener) {
        this.onPressedListener = onPressedListener;
    }

    private void initForAccessibility(Context context) {
        accessibilityManager =
                (AccessibilityManager) context.getSystemService(Context.ACCESSIBILITY_SERVICE);
    }

    public void setLongHoverContentDescription(CharSequence contentDescription) {
        longHoverContentDesc = contentDescription;

        if (longHovered) {
            super.setContentDescription(longHoverContentDesc);
        }
    }

    @Override
    public void setContentDescription(CharSequence contentDescription) {
        if (longHovered) {
            backupContentDesc = contentDescription;
        } else {
            super.setContentDescription(contentDescription);
        }
    }

    @Override
    public void setPressed(boolean pressed) {
        super.setPressed(pressed);
        if (onPressedListener != null) {
            onPressedListener.onPressed(this, pressed);
        }
    }

    @Override
    public void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);

        hoverBounds.left = getPaddingLeft();
        hoverBounds.right = w - getPaddingRight();
        hoverBounds.top = getPaddingTop();
        hoverBounds.bottom = h - getPaddingBottom();
    }

    @Override
    public boolean performAccessibilityAction(int action, Bundle arguments) {
        if (action == AccessibilityNodeInfo.ACTION_CLICK) {
            simulateClickForAccessibility();
            return true;
        }

        return super.performAccessibilityAction(action, arguments);
    }

    @Override
    public boolean onHoverEvent(MotionEvent event) {
        // When touch exploration is turned on, lifting a finger while inside
        // the button's hover target bounds should perform a click action.
        if (accessibilityManager.isEnabled() && accessibilityManager.isTouchExplorationEnabled()) {
            switch (event.getActionMasked()) {
                case MotionEvent.ACTION_HOVER_ENTER:
                    // Lift-to-type temporarily disables double-tap activation.
                    wasClickable = isClickable();
                    wasLongClickable = isLongClickable();
                    if (wasLongClickable && longHoverContentDesc != null) {
                        if (longHoverRunnable == null) {
                            longHoverRunnable =
                                    new Runnable() {
                                        @Override
                                        public void run() {
                                            setLongHovered(true);
                                            announceForAccessibility(longHoverContentDesc);
                                        }
                                    };
                        }
                        postDelayed(longHoverRunnable, LONG_HOVER_TIMEOUT);
                    }

                    setClickable(false);
                    setLongClickable(false);
                    break;
                case MotionEvent.ACTION_HOVER_EXIT:
                    if (hoverBounds.contains(event.getX(), event.getY())) {
                        simulateClickForAccessibility();
                    }

                    cancelLongHover();
                    setClickable(wasClickable);
                    setLongClickable(wasLongClickable);
                    break;
                default: // No-op
                    break;
            }
        }

        return super.onHoverEvent(event);
    }

    /**
     * When accessibility is on, simulate press and release to preserve the semantic meaning of
     * performClick(). Required for Braille support.
     */
    private void simulateClickForAccessibility() {
        // Checking the press state prevents double activation.
        if (isPressed()) {
            return;
        }

        setPressed(true);

        // Stay consistent with performClick() by sending the event after
        // setting the pressed state but before performing the action.
        sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED);

        setPressed(false);
    }

    private void setLongHovered(boolean enabled) {
        if (longHovered != enabled) {
            longHovered = enabled;

            // Switch between normal and alternate description, if available.
            if (enabled) {
                backupContentDesc = getContentDescription();
                super.setContentDescription(longHoverContentDesc);
            } else {
                super.setContentDescription(backupContentDesc);
            }
        }
    }

    private void cancelLongHover() {
        if (longHoverRunnable != null) {
            removeCallbacks(longHoverRunnable);
        }
        setLongHovered(false);
    }

    public interface OnPressedListener {

        void onPressed(View view, boolean pressed);
    }
}
